(19)

(11)

EP 4 078 623 A1

(12)

(43) Date of publication: 26.10.2022 Bulletin 2022/43 (21) Application number: 20830141.6 (22) Date of filing: 15.12.2020

(51) International Patent Classification (IPC):  G21F 1/08(2006.01) G21B 1/11(2006.01) H01F 6/06(2006.01) G21F 1/12(2006.01) G21B 1/05(2006.01) (52) Cooperative Patent Classification (CPC): G21F 1/125; H01F 6/06; H01F 27/363; G21B 1/11; G21B 1/057; G21F 1/08; Y02E 30/10; Y02E 30/30 (86) International application number: PCT/EP2020/086259 (87) International publication number: WO 2021/122623 (24.06.2021 Gazette 2021/25)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 20.12.2019 GB 201919059 23.09.2020 GB 202015029 (71) Applicant: Tokamak Energy Ltd Abingdon, Oxfordshire OX14 4SD (GB)	(72) Inventors: ASTBURY, Jack Abingdon, Oxfordshire OX14 4SD (GB) DAVIS, Thomas Evesham WR11 4EU (GB) MIDDLEBURGH, Simon Chester, CH3 5NE (GB) (74) Representative: Marks & Clerk LLP  15 Fetter Lane London EC4A 1BW London EC4A 1BW (GB)